Speaking the truth in love is always preferred. Not speaking the truth to someone is not love – it is hate. However, the whole counsel of scripture must be applied to handle the “truth” rightly. If you are not working at understanding the whole counsel of scripture, maybe your speech is better left unsaid. Additionally, social media is not always the best place to “speak the truth”:
Matthew 18:15: “Now if your brother sins against you, go [in person – not Facebook or Twitter, etc.] correct him between you and him alone [not for the world to see].
With that said, social media can be an fun place to interact with others. A few reminders for you when you do:
“Let your speech always be gracious, seasoned with salt” (Col. 4:6).
“By your words you will be justified, and by your words you will be condemned” (Matt. 12:37).
“Love one another with brotherly affection. Outdo one another in showing honor” (Rom. 12:10).
“Let no corrupting talk come out of your mouths, but only such as is good for building up, as fits the occasion, that it may give grace to those who hear” (Eph. 4:29).
“If anyone thinks he is religious and does not bridle his tongue but deceives his heart, this person’s religion is worthless” (James 1:26).